What Should I Avoid While Taking CIALIS. Do not use other ED medicines or ED treatments. Do not drink too much alcohol (for example, 5 glasses of wine or 5 shots of whiskey). Drinking too much alcohol can increase your chances of getting a headache or getting dizzy, increasing your heart rate, or lowering your blood pressure. What Are The Possible Side Effects Of CIALIS. The most common side effects with CIALIS are: headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose.